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【单选题】
Why is the book Silent Spring important to America' s environmental protection?A.
It describes a silent spring.
B.
It topped the book sales lists.
C.
It changed how American thought about nature.
D.
It includes all Carson's research achievements.
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举一反三
【单选题】Don't be discouraged ______ you have fallen behind others.
A.
whether
B.
as if
C.
even if
D.
however
【单选题】— I'm afraid I have to give it up． — Don't be discouraged. Remember _____ sticks to his work will succeed one day． [ ]
A.
anyone
B.
who
C.
no matter who
D.
whoever
【单选题】— I failed my driving test again. — Don't be discouraged. You'll be successful ________.
A.
at times
B.
at one time
C.
on time
D.
in time
【单选题】学习运算符+= 表达的含义;%=表达的含义;.=表达的含义。 $a += $b; 相当于 $a = $a + $b; $a %= $b;相当于 $a = $a%$b; $a .= $b; 相当于 $a =$a$b; .=是连接两个变量,主要用于字符串的连接。 下述各选项中,哪( )项是正确的。
A.
$a += $b; 相当于 $a = $b;
B.
$a %= $b;相当于 $a = $a%$b;
C.
$a .= $b;没有这种表示，是错误的
D.
$a .= $b; 相当于 $a =$a/$b;
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