认真细致的观察和分析实验现象，有助于获得化学知识并学会科学探究的方 法。以下分析

在50米赛跑中，小东用了11秒，小刚用了10秒，小东跑得快．______．（判断对错）

If you have decided to study abroad, you might be looking for effective ways to prepare your language skills before you depart. Some students attend ESL (English as a Second Language) classes at local schools while others practice with   1  conversational partner. However, for those in situations   2  these two options are not available, studying ESL online might be the next alternative.

During the past decade, many websites have sprung up on the Internet,   3  (provide) ESL activities to help people practice the major language skills  4  grammar, reading, and vocabulary. Perhaps the  5  (great) interests for students are websites that focus on listening and speaking skills. In the past, listening to audio online was a very slow process, but since high-speed connections appeared, things  6  (change) greatly. A simple Internet search using the term “ESL” will bring up thousands of relevant websites out there, but not all the sites are the same. 7  you want to find a site that is suitable for you, you should look among those that combine good contents with a user-friendly interface and style.

Finally, no matter which site you end up visiting, you should set some goals  8  your study.   9  might include the number of vocabulary you want to learn, specific grammar structures you want to review,  10  even how many minutes you want to read aloud from a newspaper in English.

日本手卷水果寿司，用紫菜裹以大米饭、少许水果丁和调料后切成小卷

常用温度计有煤油温度计和水银温度计两种。在制作温度的过程中，需要对煤油和水银的特性加以比较。在没有物态变化的情况下，试计算：

（1）质量相等的煤油和水银，升高相同温度是时，吸收的热量之比Q_煤油：Q_水银=________；

（2）体积相等的煤油和水银，升高相同温度时，吸收的热量之比Q＇_煤油：Q＇_水银=_________。

附：煤油和水银的比热容和密度

白细胞减少和粒细胞缺乏的预后包括（）

A.病因

B.程度

C.进展情况

D.治疗措施

E.持续时间