It is _____ and _____ today. [ ] A. cold_爱下问搜题

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问题选择题

It is _____ and _____ today. [ ]

A. cold; windy

B. snow; wind

C. hot; wind

D. cold; wind

答案

答案：A

选择题

It snowed heavily last night and we had to use thick sticks to _____ the roof of the hut. [ ]

A. hold on

B. hold up

C. hold back

D. hold out

单项选择题

骨骼肌是否发生强直收缩，主要取决于（）

A.刺激强度

B.刺激持续时间

C.刺激频率

D.刺激的环境

E.刺激强度对于时间的变化率