问题 单项选择题

氢气的浓度低于()%,便不能点燃。

A、7

B、4

C、5

D、6

答案

参考答案:B

阅读理解

Earthquake Intensity & Observed Effects(强度与现象)

I.       Felt by only a few people under very special conditions.

II. Felt by only a few people at rest, especially on the upper floors of buildings.

III. Felt noticeably indoors, especially on upper floors of buildings.

IV. Felt indoors by many people, outdoors by a few; some awaked.

V.    Felt by nearly everyone; many awaked; dishes and windows break; plaster (灰泥) cracks (开裂).

VI. Felt by everyone; many frightened and run outdoors; heavy furniture such as tables and shelves moves.

VII.   Everyone runs outdoors; small to moderate (中等的) damage(损毁) in usual buildings.

VIII. Considerable (相当大的) damage in usual buildings; monuments(碑) fall.

IX.    Considerable damage in all buildings; ground cracks; underground pipes (管道) break.

X.      Most buildings damaged; rails bend(弯曲); landslides (山崩) take place; water splashes(溅落) over banks.

XI.    Few buildings left standing; bridges damaged; wide cracks in the ground; underground pipes break.

XII.   Damage total; waves seen on ground; objects thrown into air.

小题1:According to the picture, what is the possible position of the earthquake’s epicenter?

A.36°N, 90°W.

B.36°N, 90°E.

C.90°N, 36°W.

D.90°N, 36°E.小题2:What is the effects of earthquake intensity IV?

A.Everyone runs outdoors.

B.Only a few people feel it.

C.Many people who stay indoors feel it.

D.Felt by people on the upper floors of buildings.小题3:According to the picture, which city would have announced the report: “Nearly everyone felt the earthquake, and many people were awaked. Dishes and windows were broken”?

A.Cincinnati.

B.Louisville.

C.Pittsburgh.

D.Nashville.小题4:Which statement best describes the earthquake intensity at Boston?

A.Felt indoors by few people under very special conditions.

B.Few buildings left standing.

C.Felt noticeably indoors, especially on upper floors of buildings.

D.Felt indoors by many people, outdoors by a few, some awaked.小题5:For which city was the description of an earthquake “Heavy furniture moved, everyone  felt it, and many were frightened and ran outdoors” reported?

A.Nashville.

B.Louisville.

C.Syracuse.

D.Cincinnati.

单项选择题