问题 填空题

下图是工业上制备氢气的微观示意图,其中不同的球代表不同种原子。

该反应共涉及_________种元素______种分子,其中属于单质的是________(填化学式)。

答案

 三;四;H2

阅读理解

阅读理解。

     One Sunday a few of us decided to take advantage of the first sunny day we'd have for ages to take a

trip down to the coast to visit the penguins again. Last time I went down there was a couple of months ago

and it was a dull cold day. Sunday couldn't have been more different-clear skies and sunshine made it feel

like summer, although it was still -25°C.

     Six of us drove to the coast. It was the first time we'd been off the base on our own without our field

assistant, so it had a slightly different feeling-more like a few friends going to the seaside than an Antarctic

field trip! When we reached Windy Creek, we luckily caught sight of quite a few small flying seabirds, which

are seldom seen there.

     Once on the sea ice we found that some of the more curious penguins had wandered over from the main

group to come and check us out. We'd been told that then they were nursing their chicks (刚孵出的幼雏)

and they would be more careful and nervous than last time, but that didn't seem to be the case. We walked

across to the main group which were stretched for a couple of miles along the coast. We sat down for some

sandwiches and soon found ourselves surrounded by many curious observers. Without any attackers on land,

they were very brave and came within a meter of us to pose (摆姿势) for photos.

     Before heading back, we spent a few hours on the sea ice watching the penguins and their chicks, which

had grown dramatically (明显地) since our last visit. It was such a nice day.

1. When did the trip most probably happen?

A. On a dull Sunday.

B. On a warm Sunday.

C. On a summer Sunday.

D. On a winter Sunday.

2. It can be inferred from the second paragraph that the six people _____.

A. felt a little nervous

B. felt a little excited

C. were left all by themselves on their Antarctic base

D. got bored with staying with their field assistant

3. What does the writer mean by saying "but that didn't seem to be the case"?

A. They were told a lie.

B. A wrong decision was made.

C. The truth was the opposite.

D. They didn't believe what they were told.

4. The six people did the following during the trip EXCEPT _____.

A. feed the penguins

B. take pictures of the penguins

C. enjoy watching flying seabirds

D. watch the young penguins

单项选择题