实验室欲制氢气，所用稀盐酸和稀硫酸的浓度相同，反应速率最快的_爱下问搜题

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问题不定项选择题

实验室欲制氢气，所用稀盐酸和稀硫酸的浓度相同，反应速率最快的是[ ]

A．纯锌与稀硫酸反应　　　

B．纯锌和浓硫酸反应

C．纯锌与稀盐酸反应　　　

D．粗锌(含铅、铜杂质)与稀硫酸反应

答案

答案：D

完形填空

完形填空。

     Mrs White lives in the country , and she doesn't know London very well.
One day , she goes to London.She can't find her   l   . Just then she   2  a man
near a bus stop. "I can ask him the way, "  she says to     3    and asks, " Excuse me, can you    4    me the way to King Street?" The man smiles with     5
answer. He   6  know English. He speaks Japanese. He is a visitor. Then he   7  his hand into his pocket (口袋) ,  8  a piece of paper and let her   9   it. On
the paper are these words," Sorry ,I  10    English. "

( )1. A. street
( )2. A. looks at
( )3. A. herself
( )4. A. speak
( )5. A. not
( )6. A. don't
( )7. A. puts
( )8. A. bring out
( )9. A. to see
( )10.A. am not speak

B. way
B. watches
B. himself
B. say
B. an
B. doesn't
B. takes
B. take out
B. look at
B. don't speak

C. room
C. sees
C. myself
C. talk
C. no
C. isn't
C. brings
C. takes out
C. to look at
C. don't say

D. house
D. looks
D. themselves
D. tell
D. any
D. does
D. gives
D. takes away
D. watches
D. don't talk

单项选择题

图是形成北半球近地面风的各种力的示意图，据图，下列说法正确的是（）

①a是使空气水平运动的水平气压梯度力

②b使风向偏转的地面摩擦力

③c是使风向发生变化的水平气压梯度力

④c是使风向向右偏转的地转偏向力

A、②③

B、①③

C、①④

D、③④