求教几道英语选择题
1.A large fish was slowly swimming through the water,its tail __ back and forth like
the pendulum of a clock.
A) swung B) swinging C) was swung D) was swinging
2.The cells were designed to _______ sunshine to electricity to run a motor.
A) modify B) alter C) convert D) exchange
3.The fire started on the first floor of the hospital_____are elderly and weak.
A) many of whose patients B) many of which patients
C) many of its patients D) many patients of whom
4.A _______ exercise such as running is helpful to our health.
A) vigorous B) cautious C) precious D) various
5.The information was later admitted _______ from unreliable seurces.
A) that it was obtained B) that it has been obtained
C) to be obtained D) to have been obtained