We can trace many causes for the occurrence and development of hydrological phenomena. Therefore, the change in hydrological phenomena . A: has a completely deterministic pattern B: has a completely statistical pattern C: has causality pattern D: has no pattern

Hypotheses are tentative explanations of observed phenomena.

The researcher drew a conclusion that the data （ ） not sufficient to exlain the phenomena.

Today he is capable of making scientific __________ of natural __________. A: analysises; phenomena B: analyses; phenomenon C: analyses; phenomena D: analyses; phenomenas

_________Phenomena fundamentally change the world around us.

The main causes of this phenomena ____________ the factors of profit. （在于）

Which of the phenomena may not occur if there is an energy crisis?

The researcher _______carefully the differences between the two phenomena. A: explore B: exploring C: explored D: is explored

There is no doubt that these phenomena are shocking and should arouse our social concern.

A．difficultiesB．phenomenaC．problemsD．situations A: difficulties B: phenomena C: problems D: situations