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【单选题】
下列疾病中,属于多基因遗传病的是A.
色盲
B.
唇裂
C.
先天愚型
D.
白化病
E.
多指
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【单选题】如 图,平行板电容器经开关 K与电池连接,a处有一带电量非常小的点电荷。K是闭合的,U a 表示 a点的电势,F表示点电荷受到的电场力。现将电容器的B板向下稍微移动,使两板间的距离增大,则( )
A.
U a 变大， F变大
B.
U a 变大，F变小
C.
U a 不变，F不变
D.
U a 不变，F变小
【单选题】Audrey won an Oscar _______ Best Actress _______ her role in this film. [ ]
A.
for; for
B.
as; in
C.
as; for
D.
for; in
【简答题】However, Audrey never allowed her sorrow to conquer her or to spoil her hope for a better future.
【单选题】如图9-4-12所示,平行板电容器经开关S与电池连接,a处有一电荷量非常小的点电荷,S是闭合的,φ a 表示a点的电势,F表示点电荷受到的电场力.现将电容器的B板向下稍微移动,使两板间的距离增大,则( )
A.
φ a 变大,F变大
B.
φ a 变大,F变小
C.
φ a 不变,F不变
D.
φ a 不变
【单选题】—I often see him working hard in his spare time. —________he has won the scholarship from time to time.
A.
No wonder
B.
No doubt
C.
No way
D.
No problem
【简答题】Most of his spare time ____spent in reading.A. are B. were C. was D. have
been
【单选题】I am very worried because my son ________ most of his spare time ________ playing games on the computer.
A.
concentrates；on
B.
concentrates；in
C.
focuses；to
D.
focuses；in
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