在多细胞动物早期胚胎发育过程中，由内胚层所包围的空腔称为（）；在中胚层之间裂开形成的

下列句子中，划线熟语使用恰当的一句是  （   ）

A．修改文章的工作主要是增删润饰，或删繁就简，去粗存精，或狗尾续貂、锦上添花。

B．今年五月游颐和园，华天丽日，殿阁巍峨，泛舟昆明湖上，水光潋滟，岸柳成阴，秀色可餐。

C．我收到一封国外来信，上面的邮票神不知鬼不觉地不见了，不知被哪个集邮迷撕去了。

D．正在我应答无言的时候，他面对众多提问者三言两语解了我的围，真是妙语解颐呀。

Like all vertebrates(脊椎动物), fish have sense organs that tell them what is happening within their environment. The organs enable them to see, hear, smell, taste and touch.

A fish’s eyes differ from those of land vertebrates in several ways. For example, most fish can see to the right and to the left at the same time for the fact that a fish has no neck and so cannot turn its head. Fish also have no eyelids. For land vertebrates, eyelids(眼睑）help moisten(使湿润) their eyes and protect them from sunlight. A fish’s eyes are kept moist by the flow of water over them. They do not need to be shielded from sunlight because it is seldom extremely direct and bright underwater. Some fish have unusual adaptations of the eye. For example, a flatfish has two eyes on the same side of the head. A flatfish spends most of the time lying on its side on the ocean floor and so needs eyes only on the side that faces upward. The eyes of certain deep-sea fish are at the ends of short structures that stick out from the head. These structures can be raised upward, allowing the fish to see overhead as well as to the side and to the front.

A few kinds of fishes are born blind. They include certain species of catfish that live in total darkness in the waters of caves. Some of these fishes have eyes but no vision(视觉). Others lack eyes completely.

小题1:Why can’t a fish turn its head? (no more than 6 words)

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小题2:What can prevent land vertebrates’ eyes from sunlight? (no more than 3 words)

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小题3:Why are the flatfish’s eyes different from other fishes’? (no more than 14 words)

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小题4:What is the passage mainly about? (no more than 6 words)

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患儿，男，8岁，2小时前骑自行车摔倒，自诉上前牙与地面碰撞，无晕厥史。检查见左上唇有少量擦伤，双侧上中切牙均未完全萌出，其中左上中切牙萌出相对较多。双侧上中切牙无松动，牙龈无异常，叩诊左上中切牙音高，右上中切牙音低沉。仅从以上条件最有可能的诊断是（）

A.左上中切牙嵌入

B.右上中切牙嵌入

C.左上中切牙部分脱位

D.右上中切牙部分脱位

E.双侧上中切牙部分脱位

某工程项目业主邀请了三家施工单位参加投标竞争。各投标单位的报价如表7-1所示，施工进度计划安排如表7-2所示。若以工程开工日期为折现点，贷款月利率为1%，并假设各分部工程每月完成的工作量相等，并且能按月及时收到工程款。

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