如果保户需要一种保费低廉、投保简捷、核保简单的险种，那么你会向他推荐：（ ）A．

2007年5月27日，张某乘坐出租车，不慎将装有手机和三千元现金的手包丢在了车上，后被司机郭某拾得。第二天，张某与郭某见面了……

情境一：郭某确认手包是张某的后，主动归还。请你评价郭某的行为。

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情境二：张某要求郭某归还手包，郭某谎称自己没看见，拒绝归还。请你推测张某可能采取哪几种方法解决这件事？并运用法律知识对推测进行评析。

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心室肌的后负荷是指

A．心房内压力

B．心室收缩前腔内容积或压力

C．大动脉血压

D．回心血量

E．中心静脉压

如何繁殖下列花卉植物：大丽花、百合、蟆叶秋海棠、仙客来？

The questions in this group are based on the content of a passage. After reading the passage, choose the best answer to each question. Answer all questions following the passage on the basis of what is stated or implied in the passage.

If you ask a person on the street to name the top predator in the sea, most people would probably say the great white shark. But they would be wrong. A great white shark is a relentless eating machine, superbly designed for its role at the top of the food chain, but the fact is, when a great white shark meets a killer whale, the killer whale has lunch. Not bad for an animal that is neither a whale nor a killer.

The killer whale, known to scientists as orcinus orca, is one of the largest, fastest, and most intelligent predators in the world’s oceans. The orca is not technically a whale, but rather the largest member of the dolphin family. The name "orca" has become the preferred name for the animal, because the name "killer whale" perpetuates the myth that orcas are dangerous to humans; in fact, there has never been a recorded incident of an orca attacking a human in the wild. This is not to say, however, that orcas are not dangerous to other marine species. Orcas in the wild have been observed consuming an astonishing variety of marine species, including salmon, tuna, sharks, giant squid, penguins, sea lions, dolphins, and even other whales, which the orcas hold under water until they drown. It is thought that the English name "killer whale" came from a mistranslation of the Spanish name asesina de ballenas, or "whale killer."

Despite decades of study, many aspects of the creatures’ life cycle and habits remain mysteries. Biologists only recently determined that there are, broadly speaking, three separate types of killer whale: residents, transients, and off shores. The residents live in large pods of up to 40 animals and primarily eat fish; these axe the most social of the killer whale types, with each pod having distinctive songs and complex social interactions. Transients are much quieter animals who roam large distances in groups of two to six while hunting marine mammals such as sea lions and dolphins. It is the transients who earned the orca the reputation of being whale killers. The third type of orca is the offshore variety, which rarely ventures toward coasts. These poorly understood animals travel in large groups, are somewhat smaller than their coastal cousins, and are thought to eat fish, sharks, and squid, but probably not other mammals.

According to the information presented in the passage, what can be inferred about an orca that is observed killing and eating a juvenile minke whale ？（）

A. The orca is part of a large pod of orcas that rarely approaches coastal areas.

B. The orca is eating the minke whale only because the orca’s normal food, fish such as salmon and tuna, cannot be found in the area.

C. The orca engaged in distinctive songs and complex social interactions with the minke whale prior to killing it.

D. The orca is most likely of the variety of killer whales known as transients.

E. If the orca had not eaten the minke whale, the minke whale would most likely have been eaten by a great white shark.

构成投资组合的证券甲和证券乙，其标准差分别为12%和8%。在等比例投资的情况下，如果两种证券的相关系数为1，该组合的标准差为10%；如果两种证券的相关系数为-1，则该组合的标准差为2%。 ( )