【单选题】From the last paragraph it can be concluded that the continuous growth of retired people
A.
will contradict future industrial development.
B.
will stabilize the economies of such communities.
C.
will spoil the relationship between the elderly and the young.
D.
will be good for tourist industry.
【单选题】黄山风景秀丽,近年来却因有人随意乱扔塑料袋而面目全非,塑料对环境的危害主要在于?
【单选题】现行党政机关公文中,最为典型的平行文指的是:
【单选题】Scientists argue that the disease that caused the plague is likely to be _______.
【单选题】下列材料中,焊接性能最差的材料是( )。
【单选题】Scientists argue that the genetic testing is not perfect partly because ______.
A.
it chiefly centers on predictive gene testing
B.
the health care for patients is not professional
C.
it may arouse the patients' discomfort mentally
D.
it involves the DNA test and biochemistry
【单选题】下列有关组合逻辑电路的说法中,错误的是( )
【判断题】组合逻辑电路是由逻辑门电路组成的,没有记忆单元,没有从输出到输入端的反馈回路。