A、 家用电器
B、 高压、超高压系统
C、 雷雨天气
D、 无线电广播通讯设备
答案:C
A、 家用电器
B、 高压、超高压系统
C、 雷雨天气
D、 无线电广播通讯设备
答案:C
A. go off
B. go by
C. go over
D. go against
A. explain
B. explains
C. toexplain
D. explaining
A. broke
B. started
C. declared
D. spread
A. really
B. almost
C. hardly
D. still
A. had begun
B. will begin
C. has begun
D. begins
A. ②④⑤
B. ①③④
C. ②③⑤
D. ①②③
A. 不填; a
B. a;不填
C. the;a
D. a; the
A. discovering
B. returning
C. borrowing
D. making
A. explained
B. explain
C. to explain
D. explaining